The part number **HTK-35V391MHC5EX-R2** refers to a high-performance **Aluminum Electrolytic Capacitor**, specifically designed for surface-mount technology (SMT). These are typically used in automotive or industrial applications requiring high temperature resistance and low impedance. --- ### 1. Part Number Breakdown Based on standard industry naming conventions (likely from a manufacturer like **Lelon** or **Nichicon**), here is the technical breakdown: | Code Segment | Meaning | Technical Specification | | :--- | :--- | :--- | | **HTK** | Series Name | High temperature, low impedance, long life series. | | **35V** | Voltage Rating | 35 Volts (DC Working Voltage). | | **391** | Capacitance | 390 µF (39 x 10^1). | | **M** | Tolerance | ±20% (Standard industry tolerance). | | **HC5** | Case Size | Refers to dimensions (e.g., 8x10.5mm or similar). | | **EX** | Modification | Internal code for specific electrolytes or lead styles. | | **R2** | Packaging | Tape & Reel (T&R) for automated assembly. | --- ### 2. Core Technical Specifications This component is built for stability under harsh electrical conditions. * **Capacitance:** 390 Microfarads (µF). * **Rated Voltage:** 35V DC (Surge voltage typically 40V-44V). * **Operating Temperature:** Generally rated up to **+125°C** (Standard for HTK series). * **Mounting Type:** SMD (Surface Mount Device) / V-Chip. * **Impedance/ESR:** Characterized as "Low ESR" to minimize heat generation during high-frequency operation. --- ### 3. Key Applications Because of the **HTK** designation (High Temperature), this part is commonly found in: 1. **Automotive Electronics:** Engine Control Units (ECUs), ADAS sensors, and infotainment systems. 2. **Power Supplies:** Filtering and smoothing in DC-DC converters. 3. **Industrial Lighting:** LED drivers where internal heat is a factor. 4. **Telecommunications:** Base station power modules. --- ### 4. Handling & Assembly ```markdown * **Polarity:** As an electrolytic capacitor, it is polarized. The negative terminal is usually marked with a black/dark stripe on the top of the aluminum can. * **Reflow Soldering:** Designed for Lead-Free (RoHS) reflow profiles. Excessive heat duration can dry out the electrolyte prematurely. * **Storage:** Should be kept in original moisture-barrier packaging to prevent oxidation of the solder terminals. ```